The Jessica Harrington-trained Alpine Star overcame a 302-day absence to run out an emphatic winner of the Coronation Stakes from six race-fit rivals under Frankie Dettori.

A half-sister to multiple Group One winner Alpha Centauri, who won this race in 2018, Alpine Star won two of her three outings as a juvenile, including a victory in the Debutante Stakes at the Curragh when last seen in August. 

James Doyle set a strong tempo in the early stages on Run Wild, with Dettori having to roust along his mount at times. 

Cloak Of Spirits, runner-up behind Love in the 1000 Guineas 13 days earlier, assumed the lead in the straight, with Newmarket third and 2-1 favourite Quadrilateral also looming large. 

However, Alpine Star (9-2) was finding plenty for pressure on the rail, and she took off just before the furlong pole and stretched four and a quarter lengths of her nearest rival at the line, as Dettori finally landed the only Royal Ascot Group One to elude him in his illustrious career. 

US raider Sharing (16-5) stayed on well to chase the winner home. 

"It's incredible, obviously I can't go racing at present and watching on the television isn't easy," the victorious trainer told Sky Sports Racing from County Kilkenny. 

"I couldn't believe it, she was the only horse in the field who hadn't had a run this year but she is amazing.

"She's a half-sister to a complete superstar who gave me my first Royal Ascot winner, but she was amazing today.

"She's very laid back. Alpha was an imposing filly but this filly is not big and not a great colour - you wouldn't pick her out in a ring - but she has a wonderful attitude.

"She doesn't burn up the gallops, she'd never inspire you, but every time you give her a squeeze she responds, Frankie was riding some way out.

"You're nervous watching from Ireland - it's unbelievable. It's sad for Shane (Foley) as he would have been on, but we're in strange times. I'm just thrilled to have a winner there, it's something we'll never forget.

"This was the plan so I don't know what is next, I'll talk to the owners and we'll see what happens."

Dettori said: "It's great. I really fancied the filly. I didn't want to jinx it. I kept quiet.

"Jessie approached me about 10 days ago when she knew their jockey couldn't fly here. I knew she was an exciting ride. I asked John (Gosden) permission to ride this filly and he said yes.

"Everything went to plan. I had a decent draw, I hit a flat spot, I got a split on the fence and the rest is history."